Flux compensation for SQUID-detected Magnetic Resonance Force Microscopy. (March 2019)

• Record Type: Journal Article
• Authors: de Wit, M.; Welker, G.; Hoekstra, F.G.; Oosterkamp, T.H.
• Is Part Of: Cryogenics. Volume 98(2019)
• Page Start: 67
• Page End: 70
• Publication Date: 2019-03
• Subjects: MRFM -- SQUID -- Noise cancellation -- Crosstalk reduction -- milliKelvin temperatures; Low temperature engineering -- Periodicals; Low temperature research -- Periodicals; 536.56
• DOI: 10.1016/j.cryogenics.2019.01.001
• Languages: English
• ISSNs: 0011-2275

Abstract

Highlights: The flux crosstalk in SQUID-detected MRFM can be reduced significantly using balancing techniques. Dissipation of the balancing technique is sufficiently low. milliKelvin operating temperatures are possible for MRFM when using a SQUID-based detection scheme. Abstract: One of the major challenges in performing SQUID-detected Magnetic Resonance Force Microscopy (MRFM) at milliKelvin temperatures is the crosstalk between the radiofrequency (RF) pulses used for the spin manipulation and the SQUID-based detection mechanism. Here we present an approach based on balancing the flux crosstalk using an on-chip feedback coil coupled to the SQUID. This approach does not require any additional components near the location of the sample, and can therefore be applied to any SQUID-based detection scheme to cancel predictable RF interference. We demonstrate the effectiveness of our approach by showing that we can almost completely negate flux crosstalk with an amplitude of up to several Φ 0 . This technical achievement allows for complicated magnetic resonance protocols to be performed at temperatures below 50 mK.